<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ --> <title>XMonad/Actions/MouseGestures.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-2"></a><span class='hs-comment'>-- |</span> <a name="line-3"></a><span class='hs-comment'>-- Module : XMonad.Actions.MouseGestures</span> <a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Lukas Mai</span> <a name="line-5"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span> <a name="line-6"></a><span class='hs-comment'>--</span> <a name="line-7"></a><span class='hs-comment'>-- Maintainer : <l.mai@web.de></span> <a name="line-8"></a><span class='hs-comment'>-- Stability : unstable</span> <a name="line-9"></a><span class='hs-comment'>-- Portability : unportable</span> <a name="line-10"></a><span class='hs-comment'>--</span> <a name="line-11"></a><span class='hs-comment'>-- Support for simple mouse gestures.</span> <a name="line-12"></a><span class='hs-comment'>--</span> <a name="line-13"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span> <a name="line-14"></a> <a name="line-15"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Actions</span><span class='hs-varop'>.</span><span class='hs-conid'>MouseGestures</span> <span class='hs-layout'>(</span> <a name="line-16"></a> <span class='hs-comment'>-- * Usage</span> <a name="line-17"></a> <span class='hs-comment'>-- $usage</span> <a name="line-18"></a> <span class='hs-conid'>Direction2D</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <a name="line-19"></a> <span class='hs-varid'>mouseGestureH</span><span class='hs-layout'>,</span> <a name="line-20"></a> <span class='hs-varid'>mouseGesture</span><span class='hs-layout'>,</span> <a name="line-21"></a> <span class='hs-varid'>mkCollect</span> <a name="line-22"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-23"></a> <a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span> <a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span><span class='hs-conid'>Direction2D</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-26"></a> <a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>IORef</span> <a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span> <a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-layout'>(</span><span class='hs-conid'>Map</span><span class='hs-layout'>)</span> <a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <a name="line-32"></a> <a name="line-33"></a><span class='hs-comment'>-- $usage</span> <a name="line-34"></a><span class='hs-comment'>--</span> <a name="line-35"></a><span class='hs-comment'>-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:</span> <a name="line-36"></a><span class='hs-comment'>--</span> <a name="line-37"></a><span class='hs-comment'>-- > import XMonad.Actions.MouseGestures</span> <a name="line-38"></a><span class='hs-comment'>-- > import qualified XMonad.StackSet as W</span> <a name="line-39"></a><span class='hs-comment'>--</span> <a name="line-40"></a><span class='hs-comment'>-- then add an appropriate mouse binding:</span> <a name="line-41"></a><span class='hs-comment'>--</span> <a name="line-42"></a><span class='hs-comment'>-- > , ((modm .|. shiftMask, button3), mouseGesture gestures)</span> <a name="line-43"></a><span class='hs-comment'>--</span> <a name="line-44"></a><span class='hs-comment'>-- where @gestures@ is a 'Data.Map.Map' from gestures to actions on</span> <a name="line-45"></a><span class='hs-comment'>-- windows, for example:</span> <a name="line-46"></a><span class='hs-comment'>--</span> <a name="line-47"></a><span class='hs-comment'>-- > gestures = M.fromList</span> <a name="line-48"></a><span class='hs-comment'>-- > [ ([], focus)</span> <a name="line-49"></a><span class='hs-comment'>-- > , ([U], \w -> focus w >> windows W.swapUp)</span> <a name="line-50"></a><span class='hs-comment'>-- > , ([D], \w -> focus w >> windows W.swapDown)</span> <a name="line-51"></a><span class='hs-comment'>-- > , ([R, D], \_ -> sendMessage NextLayout)</span> <a name="line-52"></a><span class='hs-comment'>-- > ]</span> <a name="line-53"></a><span class='hs-comment'>--</span> <a name="line-54"></a><span class='hs-comment'>-- This is just an example, of course; you can use any mouse button and</span> <a name="line-55"></a><span class='hs-comment'>-- gesture definitions you want.</span> <a name="line-56"></a><span class='hs-comment'>--</span> <a name="line-57"></a><span class='hs-comment'>-- For detailed instructions on editing your mouse bindings, see</span> <a name="line-58"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_mouse_bindings".</span> <a name="line-59"></a> <a name="line-60"></a><a name="Pos"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Pos</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Position</span><span class='hs-layout'>,</span> <span class='hs-conid'>Position</span><span class='hs-layout'>)</span> <a name="line-61"></a> <a name="line-62"></a><a name="delta"></a><span class='hs-definition'>delta</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Pos</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pos</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <a name="line-63"></a><span class='hs-definition'>delta</span> <span class='hs-layout'>(</span><span class='hs-varid'>ax</span><span class='hs-layout'>,</span> <span class='hs-varid'>ay</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>bx</span><span class='hs-layout'>,</span> <span class='hs-varid'>by</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varid'>ax</span> <span class='hs-varid'>bx</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varid'>ay</span> <span class='hs-varid'>by</span><span class='hs-layout'>)</span> <a name="line-64"></a> <span class='hs-keyword'>where</span> <a name="line-65"></a> <span class='hs-varid'>d</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>abs</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-comment'>-</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <a name="line-66"></a> <a name="line-67"></a><a name="dir"></a><span class='hs-definition'>dir</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Pos</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pos</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Direction2D</span> <a name="line-68"></a><span class='hs-definition'>dir</span> <span class='hs-layout'>(</span><span class='hs-varid'>ax</span><span class='hs-layout'>,</span> <span class='hs-varid'>ay</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>bx</span><span class='hs-layout'>,</span> <span class='hs-varid'>by</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>trans</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>/</span> <span class='hs-varid'>pi</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>atan2</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ay</span> <span class='hs-comment'>-</span> <span class='hs-varid'>by</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>bx</span> <span class='hs-comment'>-</span> <span class='hs-varid'>ax</span><span class='hs-layout'>)</span> <a name="line-69"></a> <span class='hs-keyword'>where</span> <a name="line-70"></a> <span class='hs-varid'>trans</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Direction2D</span> <a name="line-71"></a> <span class='hs-varid'>trans</span> <span class='hs-varid'>x</span> <a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>rg</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>3</span><span class='hs-varop'>/</span><span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-varop'>/</span><span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>D</span> <a name="line-73"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>rg</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-varop'>/</span><span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-varop'>/</span><span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>R</span> <a name="line-74"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>rg</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-varop'>/</span><span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-num'>3</span><span class='hs-varop'>/</span><span class='hs-num'>4</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>U</span> <a name="line-75"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span> <a name="line-76"></a> <span class='hs-varid'>rg</span> <span class='hs-varid'>a</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span> <span class='hs-varop'><=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'><</span> <span class='hs-varid'>z</span> <a name="line-77"></a> <a name="line-78"></a><a name="gauge"></a><span class='hs-definition'>gauge</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Direction2D</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Pos</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IORef</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Direction2D</span><span class='hs-layout'>,</span> <span class='hs-conid'>Pos</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Position</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span> <a name="line-79"></a><span class='hs-definition'>gauge</span> <span class='hs-varid'>hook</span> <span class='hs-varid'>op</span> <span class='hs-varid'>st</span> <span class='hs-varid'>nx</span> <span class='hs-varid'>ny</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-80"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>np</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>nx</span><span class='hs-layout'>,</span> <span class='hs-varid'>ny</span><span class='hs-layout'>)</span> <a name="line-81"></a> <span class='hs-varid'>stx</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>st</span> <a name="line-82"></a> <span class='hs-keyword'>let</span> <a name="line-83"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>~</span><span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>od</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>pivot</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>stx</span> <span class='hs-keyword'>of</span> <a name="line-84"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-varid'>op</span><span class='hs-layout'>)</span> <a name="line-85"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>zp</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>d</span><span class='hs-layout'>,</span> <span class='hs-varid'>zp</span><span class='hs-layout'>)</span> <a name="line-86"></a> <span class='hs-varid'>cont</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-87"></a> <span class='hs-varid'>guard</span> <span class='hs-varop'>$</span> <span class='hs-varid'>significant</span> <span class='hs-varid'>np</span> <span class='hs-varid'>pivot</span> <a name="line-88"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-89"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>d'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dir</span> <span class='hs-varid'>pivot</span> <span class='hs-varid'>np</span> <a name="line-90"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>isNothing</span> <span class='hs-varid'>stx</span> <span class='hs-varop'>||</span> <span class='hs-varid'>od</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>d'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>hook</span> <span class='hs-varid'>d'</span> <a name="line-91"></a> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>st</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>d'</span><span class='hs-layout'>,</span> <span class='hs-varid'>np</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <a name="line-92"></a> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>cont</span> <a name="line-93"></a> <span class='hs-keyword'>where</span> <a name="line-94"></a> <span class='hs-varid'>significant</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>delta</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varop'>>=</span> <span class='hs-num'>10</span> <a name="line-95"></a> <a name="line-96"></a><a name="mouseGestureH"></a><span class='hs-comment'>-- | @'mouseGestureH' moveHook endHook@ is a mouse button</span> <a name="line-97"></a><span class='hs-comment'>-- event handler. It collects mouse movements, calling @moveHook@ for each</span> <a name="line-98"></a><span class='hs-comment'>-- update; when the button is released, it calls @endHook@.</span> <a name="line-99"></a><span class='hs-definition'>mouseGestureH</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Direction2D</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span> <a name="line-100"></a><span class='hs-definition'>mouseGestureH</span> <span class='hs-varid'>moveHook</span> <span class='hs-varid'>endHook</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-101"></a> <span class='hs-varid'>dpy</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asks</span> <span class='hs-varid'>display</span> <a name="line-102"></a> <span class='hs-varid'>root</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asks</span> <span class='hs-varid'>theRoot</span> <a name="line-103"></a> <span class='hs-layout'>(</span><span class='hs-varid'>pos</span><span class='hs-layout'>,</span> <span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-104"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>ix</span><span class='hs-layout'>,</span> <span class='hs-varid'>iy</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>queryPointer</span> <span class='hs-varid'>dpy</span> <span class='hs-varid'>root</span> <a name="line-105"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>Nothing</span> <a name="line-106"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>ix</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>iy</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <a name="line-107"></a> <span class='hs-varid'>mouseDrag</span> <span class='hs-layout'>(</span><span class='hs-varid'>gauge</span> <span class='hs-varid'>moveHook</span> <span class='hs-varid'>pos</span> <span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-varid'>endHook</span> <a name="line-108"></a> <a name="line-109"></a><a name="mouseGesture"></a><span class='hs-comment'>-- | A utility function on top of 'mouseGestureH'. It uses a 'Data.Map.Map' to</span> <a name="line-110"></a><span class='hs-comment'>-- look up the mouse gesture, then executes the corresponding action (if any).</span> <a name="line-111"></a><span class='hs-definition'>mouseGesture</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Map</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Direction2D</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>(</span><span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Window</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span> <a name="line-112"></a><span class='hs-definition'>mouseGesture</span> <span class='hs-varid'>tbl</span> <span class='hs-varid'>win</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <a name="line-113"></a> <span class='hs-layout'>(</span><span class='hs-varid'>mov</span><span class='hs-layout'>,</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mkCollect</span> <a name="line-114"></a> <span class='hs-varid'>mouseGestureH</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mov</span> <span class='hs-varid'>d</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>end</span> <span class='hs-varop'>>>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>gest</span> <span class='hs-keyglyph'>-></span> <a name="line-115"></a> <span class='hs-keyword'>case</span> <span class='hs-conid'>M</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>gest</span> <span class='hs-varid'>tbl</span> <span class='hs-keyword'>of</span> <a name="line-116"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span> <a name="line-117"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>win</span> <a name="line-118"></a> <a name="line-119"></a><a name="mkCollect"></a><span class='hs-comment'>-- | A callback generator for 'mouseGestureH'. 'mkCollect' returns two</span> <a name="line-120"></a><span class='hs-comment'>-- callback functions for passing to 'mouseGestureH'. The move hook will</span> <a name="line-121"></a><span class='hs-comment'>-- collect mouse movements (and return the current gesture as a list); the end</span> <a name="line-122"></a><span class='hs-comment'>-- hook will return a list of the completed gesture, which you can access with</span> <a name="line-123"></a><span class='hs-comment'>-- 'Control.Monad.>>='.</span> <a name="line-124"></a><span class='hs-definition'>mkCollect</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Direction2D</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m'</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Direction2D</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span> <span class='hs-varid'>m'</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Direction2D</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <a name="line-125"></a><span class='hs-definition'>mkCollect</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-126"></a> <span class='hs-varid'>acc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newIORef</span> <span class='hs-conid'>[]</span> <a name="line-127"></a> <span class='hs-keyword'>let</span> <a name="line-128"></a> <span class='hs-varid'>mov</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-129"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>acc</span> <a name="line-130"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ds'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ds</span> <a name="line-131"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>acc</span> <span class='hs-varid'>ds'</span> <a name="line-132"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>ds'</span> <a name="line-133"></a> <span class='hs-varid'>end</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <a name="line-134"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>acc</span> <a name="line-135"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>acc</span> <span class='hs-conid'>[]</span> <a name="line-136"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>ds</span> <a name="line-137"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>mov</span><span class='hs-layout'>,</span> <span class='hs-varid'>end</span><span class='hs-layout'>)</span> </pre></body> </html>
